Meet Grandpa Memo. He’s the aging alter ego of Séan Garnier, a freestyle soccer star from Sens, France, whose uncanny ability to incorporate break dancing and a jaw-dropping array of tricks into his sport has won him a devoted legion of fans worldwide. Garnier, 29, spent five hours being made up as someone well into his older years to slip incognito into a pick-up game with the locals for a commercial staged by the Mexican retail company Coppel. >> Get …